Flangers: MN3007 - CD4047

[chance.lima]

Hey guys. I have been looking over some schematics for flangers for the purpose of creating some vero layouts for everyone. I have one or 2 that are missing some details and I'd like some clarification on a few issues.

I see where you have a BBD like MN3007 Pin 2 (CP1) and Pin 6 (CP2) connected to a CD4047 chip's pins 10 and 11. Different schematics have the say MN3007 pin 2 to CD4047 pin 10 and MN3007 pin 6 to CD4047 pin 11 and then another schematic will have the pins swapped like MN3007 pin 2 to CD4047 pin 11 and MN3007 pin 6 to CD4047 pin 10. Does it matter which configuration is used or is there a specific purpose for this? My knowledge in these matters is limited but I'd like to know the answer as I try and fill in the gaps in these old schematics and build some layouts.

Cheers

[StephenGiles]

It probably doesn't make any difference (runs for cover!!!). Isn't it that the BBD requires 2 complimentary clock signals, that is to say they are out of phase with one another?

[Mark Hammer]

It's just tick and tock coming from 10 and 11, going to 2 or 6.

[ElectricDruid]

As the others have said, it makes no difference at all. The 4047 outputs are complementary (Q and ~Q) and the 3007 requires a dual phase clock, with one clock high when the other one is low and vice versa. This requirement is why the 4047 is a good choice - it has those outputs already.

Incidentally, sometimes you see a 4013 flip-flop used after some other clock circuit - again, this is chosen because it has both the normal and inverted outputs. You might come across that if you're looking at flanger designs.

HTH,
Tom

[chance.lima]

Excellent thanks for the feedback team, now I can move forward on these layouts!